合肥光源逐束团测量和横向束流反馈系统设计
Design of bunch-by-bunch measuring and transverse feedback system at HLS
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摘要: 介绍了在合肥光源开展逐束团测量（横向和纵向）和横向束流反馈系统研究和研制的重要性,同时还介绍了设计思想。合肥光源高频频率为204 MHz，因此，系统至少需要100 MHz的带宽。还较详细地介绍了宽带部件和系统参数的选择原则。该系统不仅可用于研究由于高频腔中的高阶模和真空室的阻抗壁效应所引起的耦合束团不稳定性，而且还能抑制耦合束团不稳定性振荡、快速束流离子不稳定性和注入大幅度振荡等，从而将提高机器的运行性能。Abstract: In order to cure and suppress beam instabilities caused by the high order modes (HOM) in the RF cavity and the resistive wall impedance of the vacuum chamber, a bunch by bunch measuring and transverse feedback system of broad band with two BPM is under development now. It can detect and analyze the coupled-bunch(CB) instabilities in time and frequency domain, bunch filling pattern in injection and injection ratio, and suppress CB instability for advanced machine performance. The design concepts and detailed development of the system are presented in this paper. The high frequency of HLS is 204 MHz, which requires the bandwidth of the feedback system wider than 100 MHz. The primary ideas to choose the broad-band components and the system parameters are also expounded.
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